JPH0479775A - Ultrasonic motor device - Google Patents

Abstract

PURPOSE:To reduce friction produced between a rotor and the stator by an external force when the motor is not being driven, by providing an ultrasonic piezoelectric transducer, a moving body, the first and second circuit devices, a detecting means, a controlling means, and equipment such as door mirrors etc., joined to the moving body. CONSTITUTION:The underside of the periphery of a rotor 49 is pressed against an elastic body 53 and touches it. Besides, a piezoelectric body (electrostrictive element) 55 is provided on the underside of the elastic body 53. The elastic body 53 and piezoelectric element 55 constitute an ultrasonic piezoelectric transducer (stator) 53a. Incidentally, out of circuit devices 1 a circuit containing a transformer 71 which generates a sinusoidal signal is called the first circuit device, and a circuit containing a transformer 72 which generates a cosine signal, for convenience. Here, 55s constitutes a polarization or a motor electrode (detecting means) capable of detecting the S-phase vibration of the piezoelectric body 55 in a vibrating state or in a strained state, as output. And 55g is an electrode of a piezoelectric body for 55a, 55b or for both siphases A and B used in common. Besides, 78a is a controlling means provided in a CPU 78.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to an ultrasonic motor device for driving internal and external fixtures such as door mirrors of automobiles.

(Prior Art) As an example of an ultrasonic motor device, there is a piezoelectric element for a surface wave motor disclosed in Japanese Unexamined Patent Publication No. 60-22480.

Such a conventional general ultrasonic motor detects the strain state, that is, vibration, of an ultrasonic vibrator (stator) configured by fixing a piezoelectric body to an elastic body, and applies voltages of different frequencies to the ultrasonic vibrator (stator). Progressive vibrations are applied to this to move a rotor, that is, a moving object, which is pressed against the stator, thereby driving equipment such as door mirrors, and the resonance state when the motor is driven is automatically tracked to drive the motor.

(Problem to be Solved by the Invention) However, such conventional ultrasonic motor devices have a configuration that simply detects the strain state of the piezoelectric material when driving the motor and automatically tracks the resonance state of the motor. Therefore, if a torque greater than the holding torque is applied between the rotor and stator due to an external force on the mirror when the motor is not driven, these sliding surfaces will wear out, impairing the durability of the motor. Or it may cause unpleasant noise due to slipping. There was a problem.

The present invention solves the above problems by providing an ultrasonic motor device that significantly reduces the wear caused between the rotor and stator due to external force when the motor is not driven, and does not generate unpleasant noises due to slipping. I am 17 years old with the aim of solving the problem.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides an ultrasonic vibrator in which a plurality of electrostrictive elements are fixed to an elastic body, and an ultrasonic vibrator that is brought into pressure contact with the elastic body. a moving object, a first circuit device and a second circuit device that generate vibrations of frequencies with temporally different phases in the electrostrictive element, a detection means that detects vibrations of the vibrator, and a device that drives the moving object. When the moving body is not driven, both the first circuit device and the second circuit device are driven, and when the vibration of the vibrator is detected by the detection means when the moving body is not driven, the first circuit device and the second circuit device are driven. A control means for driving one or both of the circuit devices, and an accessory device such as a door mirror connected to the moving object.

(Function) For example, if a door mirror or the like is stationary with the motor inactive and it hits the arm of an outside person and moves forward or backward, slippage will occur between the rotor and stator of the motor. The detection means detects vibrations caused by this slippage and generates an output to the control means. When the control means outputs this output to both the first and second circuit devices, the rotor is driven in that direction by progressive vibration, so that wear on the sliding surface can be reduced. Moreover, it does not produce unpleasant noises. Furthermore, when the control means outputs an output to either the first or second circuit device, the contact area of the sliding surface is reduced by the standing wave vibration, so that wear of the sliding surface can be similarly reduced. It does not cause any discomfort.

(Example) The present invention will be explained below based on the drawings.

FIGS. 1 to 8 are views showing an embodiment of the present invention in which a door mirror is applied.

First, the configuration will be explained with reference to FIG. 3, which is a front view, and FIG. 4, which is a top view. The base 10 is attached to a door and has a flapper (
It supports the door mirror body) 40. A plate 20 is fixed to this base 10 with screws 10a. A center shaft 30 is press-fitted into the main plate 20, and the plate 20
The center shaft 30 does not rotate even if torque is applied around the shaft.

In addition, the mount bracket 50 is screwed to the mirror flapper 40 (the flapper 40 and the bracket 50 may be an integral part), the joint shaft 60 (the end gear 31
Pass joint gear 70 through (attached). A bearing 80 is installed between the tip of the joint shaft 60 (upper part in the figure) and the mount bracket 50.

Furthermore, a cap 90 is pressed against the other tip (lower side in the figure) of the joint shaft 60, and the pressing force can be adjusted by a hole plunger 9 inside the cap 90. The hole plunger 91 is adjusted so that the joint shaft 60 has low sliding resistance. The center shaft 30 is passed through the center shaft hole of the assembly part (integrated part in FIG. 3) of the mirror flapper 40 and the mount bracket 50 described above, and a center gear (gear) 110 to which a limit switch 101 is fixed.
Make sure that it also penetrates. The center gear 110 is fixed to the center shaft 30, and further meshes sufficiently with the gear portion (planetary gear) 31 of the joint shaft 60.

Further, the limit switch 10 is fixed to a mount bracket 59.

Here, the limit switch 101 is
) As shown in (C), the closing operation terminal 25, the closing operation pattern section 39, the opening operation terminal 26, the opening operation pattern section 3
It consists of 8.

A motor gear 130 is fixed to the shaft of the ultrasonic motor 120. The main gear 130 meshes with the joint gear 70. In this state, the ultrasonic motor 20 is fixed to the upper surface of the mount bracket 50 with screws 1 and 20a. The mirror cover 1-40 is fixed with screws in the hole 41a of the mirror flapper 40, and all the assembly parts described above (base 1
0) are housed inside the mirror cover 140.

Regarding the structure, what has been described above shows only the left side of the vehicle, but each part may be made in opposite directions on the right side as well. Furthermore, in this embodiment, the limit switch 10
Although the terminals 25 and 26 of No. 1 are movable, the pattern portion 3839 may be movable conversely. Regarding the above-mentioned incoming switch, any other switch may be used as long as it can detect the position of the door mirror.

The base 10, mirror body 40, and cover 140 constitute a door mirror device 190.

As the detailed structure of the ultrasonic motor 120 is shown in FIG. This prevents the entry of water, oil, dust, etc., thereby preventing a decrease in torque and the occurrence of key noise. The drive shaft 19 is provided in the center of the ultrasonic motor 120, and the hole plunger 4 is connected to the upper end of the drive shaft 9 via a disc spring 43 and a bushing 45.
7 is supported. Further, a rotor 49 is attached near the upper end of the drive shaft 9, and approximately the center of the upper surface of the rotor 49 is supported by the plate spring 43 via a rubber 51. The lower side of the peripheral part of the rotor 49 is in pressure contact with an elastic body 53, and further below the elastic body 53 is a piezoelectric body (electronic element) 5.
5 is provided. The elastic body 53 and the piezoelectric element 55 constitute an ultrasonic vibrator (stator) 53a. Drive shaft] 9
A radial bear link 59 is provided on the lower side of the inner circumferential portion of the elastic body 53 close to the elastic body 53, and the middle portion of the elastic body 53 is fixed to the substrate 63 with a screw 57. Further, a cord 6 for electrical wiring is connected between the case 41 and the board 6B.
1 is inserted into the ultrasonic motor 120, and an operating signal is supplied to the ultrasonic motor 20 via the cord. The drive shaft 19 is fitted and fixed to the motor gear 130 and transmits driving force to the joint gear 70.

The hole plunger 47 supporting the upper end of the drive shaft 19 adjusts the pressing force, thereby increasing the pressure of the ultrasonic motor 1.
This is to adjust the output torque of 20. FIG. 5 is a graph showing the relationship between the output torque and the pressurizing force adjusted by the ball plunger 47. As shown in the figure, by adjusting the pressurizing force, the output torque can be increased to a level higher than a predetermined torque. It can be easily set within the pressure adjustment range. By configuring the ball plunger 47 to adjust the output torque in this way, it is possible to improve the workability of adjustment and to stabilize the performance.

FIG. 2 shows a drive control circuit for the ultrasonic motor 120.

As shown in the figure, the piezoelectric body 55 of the ultrasonic motor 120 is
The division section receives a sine wave drive signal and a cosine wave signal having a phase difference of 90' with respect to the sine wave drive signal from two opposing transformers 71 and 72 which are divided into four parts 55a, 55b, 55s and 55g. 55a and 55b, and the drive shaft 19 of the ultrasonic motor 120 rotates. Further, the CPU 78 outputs a positive/inverted signal based on the operation sw multiplication signal. If the operation SW double signal is open.
If a reverse closed signal is input, a sign in which positive and cosine are reversed is supplied from the transformer 71, 72 to the divided portion 55a55b of the piezoelectric body 55, and the drive shaft]9 rotates in the opposite direction. I will do it.

In the circuit device 1, a circuit including a transformer 71 that generates a sine wave signal will be referred to as a first circuit device, and a circuit including a transformer 72 that generates a cosine wave signal will be referred to as a second circuit device.

Here, 55s is the vibration state of the piezoelectric body 55, that is, the strain state S
It constitutes a polarization or motor electrode (detection means) that can detect phase vibration from its origin, and 55g is a piezoelectric electrode that can be used for both phases 55a, 55+), that is, AB. Also, 78a is the CPU
It is a control means provided in 78. The control means 78a includes an operation SW double signal, a door mirror opening/closing state detection signal F, and a piezoelectric body 5.
The above control signal is generated together with the CPU 78 based on either the F/B signal G when the motor is activated for 5 seconds or the slip detection signal H when the motor is not activated.

In the figure, 73 is a power transistor, 74 is a link counter for generating a positive/inverted signal divided by 4, 75 is a voltage controlled oscillator, 76 is a D/A converter, 152 is an A/D converter, 15
3 is a rectifier.

Further, the entire back side of the motor 120 in FIG. 2 is grounded.

Next, the operation of the above embodiment will be explained with reference to FIGS. 7(a), 7(b), and 7(C).

(a) During normal operation: FIG. 7(b) is a diagram showing a state in which the mirror flapper, that is, the door mirror main body 40 is open (a state in which it functions as a mirror). In this open state, when a close switch (not shown) is operated, an opening drive signal is supplied to the ultrasonic motor 120 via the closing operation terminal 25 of the mitswitch 101 and the closing operation pattern part 39, and thereby the ultrasonic The drive shaft 19 of the sonic motor 120 is shown in FIG. 7(b).
Rotate clockwise at . This rotation is transmitted from the drive shaft 19 to the planetary gear 31 via the motor gear 130, joint gear 70, and joint shaft 60, and the three planetary gears try to rotate counterclockwise, but either the center gear 110 or the center shaft 30 , the planetary gear 31 can rotate the center gear M1110. Due to the reaction force, the planetary gear 31 revolves around the center gear 110 in a counterclockwise direction, and due to this revolution, it moves from the position shown in FIG. 7(b). The door mirror is moved to the position shown in FIG. 7(a), thereby closing (retracting) the mirror flapper, that is, the door mirror body 40 as shown.

Further, in the open state shown in FIG. 7(a), an open switch (not shown) is operated, and an open/close drive signal is sent to the open operation terminal 26 of the limit switch 101 and the open operation pattern section 38.
When supplied to the ultrasonic motor 120 via the ultrasonic motor 120, the drive shaft ]9 of the ultrasonic motor 120 rotates counterclockwise in the opposite direction to the above. As a result of this rotation, the planetary gear 31 also tries to rotate clockwise, or the fixed center gear 1
] Due to the reaction force from 0, the mirror flapper door mirror body 40 revolves clockwise around the center gear 11.0 and moves from the position shown in FIG. 7(a) to the position shown in FIG. 7(b). It will be released.

(b) When activated by external force Next, the operation when the mirror flapper 40 of the electrically foldable door mirror hits a person's arm or other object and moves backward or forward will be described.

As shown in FIG. 7(b), when the mirror flapper 40 is in an open state and an object collides with the mirror flapper 40 as shown by an arrow 99 and an external force is applied,
A force that rotates the mirror flapper 40 in a clockwise direction about the center shaft 30 acts on the mirror flapper 40 . As a result, the planetary gear 31 rotates counterclockwise, revolves clockwise around the center gear 110, and attempts to move to the position shown in FIG. 7(a). During this movement, the joint I shaft 60 rotates counterclockwise with the counterclockwise rotation of the planetary gear 31, and the joint gear 70 similarly rotates counterclockwise. When the joint gear 70 rotates counterclockwise in one direction, the motor gear 130 meshing with the joint gear 79
tries to rotate clockwise.

In this case, if this rotational force is small, the motor gear 130 is connected to the ultrasonic motor 120 via the drive shaft 19.
Since the stator 53a consisting of an elastic body 53 and a piezoelectric body 55 is held in pressurized contact with the rotor 49 inside,
If the motor gear 130 does not rotate or the rotational force of the motor gear 30 exceeds a predetermined value, the sliding surface between the rotor 49 and the stator 53a of the ultrasonic motor 120 will slip, and the holding between them will be lost, causing the ultrasonic The rotor 49 of the sonic motor 20 rotates. As a result, the mirror flapper 40 is moved as shown in FIG. 7(b).
The state changes from the state to the state shown in FIG. 7(C). Conversely, if an object collides with the object from the direction opposite to the nine arrows, a force opposite to that described above is applied, and the rotor 49 of the ultrasonic motor 120 rotates in the same manner. As a result of this collision, the mirror flapper 40 becomes in a closed state as shown in FIG. 7(a).

When the mirror receives a force from the closed state to the open side due to the action of an external force in the direction of the arrow or in the opposite direction, or
When a force is applied in the closing direction from an over-open state or an open state, in the former case, the motor is driven to the open state by the contact between the opening operation terminal 26 and the pattern part 38, and in the latter case, the motor is driven to the open state. The motor is driven to the closed state by contact between the terminal 25 and the three pattern parts.

In other words, since the motor spontaneously rotates in the direction of the external force, there is no wear on the sliding surface between the motor's stator and rotor, and therefore no abnormal noise is generated.

The above-mentioned embodiment shows only the left side of the electric door mirror, or the right side can also be constructed in the same way by making each part in the left and right directions. Further, although the limit switch 101 is constructed so that its terminals 25 and 26 move, it can also be constructed so that its pattern portions 38 and 39 move. Furthermore, the limit switch 101 may be of any type as long as it can detect the position of the door mirror.

Further, as mentioned above, when the mirror plumper 40 receives a strong external force, for example manually, from the direction of the arrow 99 or in the opposite direction when the motor] 20 is not operating, the ultrasonic motor tacho 2
The sliding surface between the rotor 49 and the stem 53 in 0 generates a sine wave of about 100 kHz as shown in Fig. 6 from the piezoelectric body 55s, and this output indicates that the rotor 49 has rotated. Can be detected.

That is, as shown in FIG. 2, the control means 78a of the CPU 78 inputs the F/B signal signal during operation and the slip detection signal H during non-operation, which are signals from the electrode 55s, and the control means 78a of the CPU 78. The circuit device 1 is activated to drive the motor 120 by inputting both the door mirror opening/closing state signal F and the door mirror opening/closing state signal F.

Further, when detecting vibrations of the ultrasonic motor 120 when the ultrasonic motor 120 is not operating, the control means 78a outputs an output to either the first circuit device or the second circuit device of the circuit devices to generate a sine wave or a cosine wave. (Standing wave) vibration to elastic body (stator) 5
It may also be output so as to cause it to occur in step 3. In this case, surface waves are generated on the sliding surface with the rotor 49, and the contact area is reduced accordingly, thereby reducing wear and noise generation.

As described above, in the embodiment of the present invention, by using the components of the ultrasonic motor as they are, the inactive ultrasonic motor is activated when external force is applied, thereby reducing the wear of the sliding surface and the generation of abnormal noise. It is now possible to prevent, and
This is characterized by the fact that it can be achieved at low cost and with a simple configuration.

In the above embodiment, the sliding vibration is detected using the electrode 55S, but it may be detected by other means such as an external detection means.

FIG. 8 is a flowchart for detecting manual slippage and rotating the door mirror when the ultrasonic motor is not in operation as described above. This will be explained. First, the mirror flapper position is detected (step 200). This position detection is determined to be 0NOFF depending on whether or not the terminal 26 and the pattern portion 38 in FIG. 7 are in contact with each other. This makes it possible to distinguish between FIGS. 7(a) and 7(b). In this example, (b
) (c) cannot be determined, but there is no problem. This is because it is not necessary to determine whether the motor drive direction is determined by this because (b) and (c) are the same direction.

If the terminal 26 and the pattern portion 38 are not in contact (OFF), the process proceeds from step 2o"1 to step 21.0.

If it is in contact (ON), go to 220. Step 2
In step 1.0, if a frequency signal due to slipping is received while the door mirror is open, the CPU determines that there is a manual retraction force and drives the motor in the closing direction of the door mirror (step 21). ). Otherwise, it is sufficient to loop through step 210. The process proceeds from step 211 to step 212, and if the door mirror is opened (terminal 25 and pattern section 39 are OFF), the motor is stopped in step 213. Otherwise, the motor 120 continues to drive until the door mirror is closed. Further, as described above, even when the process moves to step 220 from step 201, the process finally moves to step 213. Furthermore, even if the loop is in the loop shown in FIG. 8, if the operating switch (not shown in this embodiment) or operated by the operator is activated, the ultrasonic motor will exit from this loop and the ultrasonic motor will be activated according to the operating switch. Flip it over and allow normal operation to occur.

In FIG. 8 showing this flow, a frequency signal emitted from the piezoelectric body 55s is used as the slip detection signal, but depending on the slip speed within the ultrasonic motor 120, a voltage signal of 5 V or more can also be used.

As explained above, in an electric door mirror device using an ultrasonic motor, when a person or other obstacle hits the mirror, the slip between the rotor and stator of the motor is detected at the moment of the collision, and the stator Since a traveling wave or a standing wave is generated to drive the motor and make it easier to rotate the mirror in the direction of the external force, it not only prevents wear on the motor sliding surface or the generation of abnormal noise, but also prevents people or other The impact force of obstacles or the impact force of the door mirror body can be reduced, improving safety.

Other embodiments are shown in FIGS. 9 to 11.

This embodiment is applied to an electric sun visor.

To explain the configuration, a sun visor body 203 is supported by a sun visor support lever 201 and a sun visor drive rail 202, and a drive rail 2 is mounted in the center of the sun visor body 203.
A slider 204 that slides inside the sun visor body 203 is fixed to the sun visor body 203 by a link 205.

A wire 206 is connected to the slider 204. Also, a motor 20 is used to move this wire 206 back and forth.
7 is fixed between the ceiling lining 208 and the roof panel 209. Note that 210 in the figure is a front window.

Fig. 10 is a side view of Fig. 9 showing the ■stored state, ■slide state, and ■swing down state.
FIG. 11 shows these ■■■ separately.

Furthermore, by forming the front end of the sun visor 203a into a convex portion 203b as shown in FIG.
1.In addition to filling the gap in the slide opening,
Shaking of the sun visor 203a can be prevented.

■ It becomes a protrusion to be hooked by hand when pulling out the sun visor 203a manually. In addition, as shown in FIGS. 13 and 14, a pantograph 212 is built into the sun visor body 203c and can be extended and retracted using a bellows 213. When retracting, the wire 206 can be pulled by a motor 207 so that it can be retracted even from the extended state. It becomes possible. By adopting this structure, it can be made effective when further light-shielding properties are required.

Next, the operation of this embodiment will be explained.

With the sun visor 203 in the retracted state (■), rotate the motor 206 to push the wire 206 forward and move the slider 204
move forward. When the slider 204 moves within the drive rail 202, the sun visor body 203 protrudes forward, and when the slider 204 moves forward from point A, the sun!・Izer main body 203 rotates and descends toward the driver. That is, it swings down to block sunlight. When retracting the sun visor 203, the sun visor 203 is retracted by rotating the motor 206 in the reverse direction.

Next, the application of the present invention to the electric sun visor shown in FIGS. 9 to 14 mentioned above will be described. As with the door mirrors, the sun visors can be opened and closed by operating S as shown in Figure 2.
This can be done using W. The ultrasonic motor 207 is operated by turning this operation SW ON and OFF, and the sun visor 203,
203a and 203C are opened and closed. When the motor 207 is not operating, the same procedure as shown in FIG. 8 of the flowchart can be performed.

That is, the position of the sun visor is detected by replacing the mirror with a sun visor, and similarly, manual slippage of the sun visor is detected by the electrode 55c in FIG.
All you have to do is follow the step order of the flow shown in the figure. To detect the position of the sun visor, for example, a limit switch for detecting locking may be provided in the sun visor drive rail 202.

Next, the side visor (
An example of application to an electric sun visor is shown below. Note that (a
) shows a view seen diagonally from above the front, (b) shows a view seen from above inside the vehicle body, and (C) shows a sectional view taken along the line CC of (b).

Side visor 302 on the back of the slide sun visor 301
are assembled, and two protrusions 303 are attached to the light sun visor 301 so as to touch the side visor 302 when the side visor 302 is stored. Further, one side of the side visor 302 is supported by a ball joint 3°4. Note that 305 is the inside mirror 306 is the vehicle body contour line, and OX is the vehicle body center line.

Furthermore, as shown in FIG. 16, since the aforementioned protrusion 303 also serves as a switch 307, it becomes impossible to store the slide sun visor when the side visor 302 is in use, and by storing the side visor, the switch, ONL, and slide sun visor cannot be stored. What you can do and what you can do.

Next, the operation of this embodiment will be explained.

Since the side visor 302 is constantly pressed by the protrusion 303 when it is stored, when the slide sun visor 3°1 slides out, the lower end of the side visor 302 also rises, making it easy to catch hands. Also, since the side visor 302 is supported on one side or by the hole joint 303, regardless of the angle of the sliding sun visor 306,
Can be adjusted on the side.

Here, we will explain the first flow when detecting slippage of the sliding electric sun visor with a side visor according to the present invention.
This will be explained with reference to FIG.

First, this flow starts as soon as the ignition key of the car is turned on. At this time, the sun visor position detection (step 300) is detected by the CPU 78 in the same way as the door mirror opening/closing state detection signal F shown in FIG. If the sun visor is open at this time, the process goes to step 302. Otherwise, go to step 320. Step 30
In step 2, if the operator uses the side visor and is out of the sun visor, this step 302 is always looped. Otherwise (if the side visor is retracted into the sun visor), go to step 310. The explanation of the subsequent steps in the flow is exactly the same as in FIG. 8. However, if an operation sW that is not shown in FIG. 8 is operated, the process leaves the flow, but in this flow (FIG. 17), even if the operation sW is operated at step 302, priority is not given. . This is to prevent damage to the side visor, sun visor, etc. if the side visor is operated without being housed in the sun visor.

As explained above, in an electric sun visor device using an ultrasonic motor without a side visor or with a side visor, when the sun visor is moved manually by pressing the operation switch, such as in a panic caused by panic while driving, the instant Since the motor is driven by detecting the slippage between the rotor and stator of the motor, it is possible to prevent wear of the sliding surface between the rotor and stator or the occurrence of abnormal noise, and also to make it easier to open and close the sun visor, making it easier to drive. It can improve the safety inside.

It should be noted that although the above-mentioned 37 embodiments show an example of application to an automobile accessory device, the present invention is not limited to automobiles.

[Effects of the Invention] As explained above, according to the present invention, the rotor in the ultrasonic motor is controlled by an external force when the motor is not driven.
Since the structure is such that when a torque greater than the holding torque is applied between the stators, sliding vibration is detected and the motor is driven, it is possible to prevent deterioration of durability due to abrasion of the sliding surface of the motor.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the configuration of an ultrasonic motor according to the first embodiment of the present invention, Fig. 2 is a block diagram of the drive circuit of the first embodiment, Fig. 3 is a front view of the first embodiment, and Fig. 4 is the same. A top view, FIG. 5 is an output torque-pressure force characteristic diagram, FIG. 6 is an S-phase output waveform diagram due to sliding vibration, and FIG. 7 is a top view showing the state of the door mirror of the first embodiment. (b) is open, (C)
8 is a diagram showing an over-open state, and FIG. 8 is a Foucault chart of the first embodiment when the door mirror is not manually rotated and the veri detection motor is not operating.
FIG. 9 is a perspective view showing a schematic configuration of the second embodiment, FIG. 10 is an operating state diagram of the second embodiment, FIG. 11 is an explanatory diagram of the operation of the slider of the second embodiment, and FIG. 13 is a side view showing still another structure of the second embodiment, FIG. 14 is a perspective view of the structure shown in FIG. 13, and FIG. 15 is a side view showing another structure of the second embodiment. In the diagram showing the schematic configuration of the third embodiment, (a)
16 is a perspective view as seen diagonally from above the front, (b) is a perspective view seen from above the passenger compartment, and (C) is a sectional view taken along line C-C in (b).
This figure is similar to FIG. 15(C), and is a schematic view of side visor storage, and FIG. 17 is a flowchart for detecting manual slippage of the sun visor when the motor is not activated. 10...Base 20...Plate 30...Center shaft 40...Door mirror body (flapper) 43...Spring 49...Rotor (rotor, operation) 5
0... Bracket 53... Elastic body 53A... Stator (ultrasonic vibrator) 55... Piezoelectric body (electrostrictive element) 55C... S phase detection electrode (detection means) 78... CPU
78a... Control means 1 0 1... Li
Mitsui no Chi 120/Ultrasonic motor] 90...Door mirror device 203...Sun visor 206...Ultrasonic motor 301...Slide sun visor 302...Side visor

Claims (1)

[Claims] An ultrasonic vibrator in which a plurality of electrostrictive elements are fixed to an elastic body,
a moving body brought into pressurized contact with the elastic body; a first circuit device and a second circuit device that generate vibrations of frequencies with temporally different phases in the electrostrictive element; and detecting vibrations of the vibrator. a detection means; when driving both the first circuit device and the second circuit device when driving the moving object, and when the detection means detects vibration of the vibrator when the moving object is not driven; An ultrasonic motor device comprising: a control means for driving one or both of a first circuit device and a second circuit device; and an accessory device such as a door mirror connected to the moving object.